# HANDOFF REPORT: Tech Art Specifications & Client Sync Architecture

**Agent**: `spec_miner_techart_3`  
**Workspace**: `c:\Projects\FreeExile\.agents\teamwork\spec_miner_techart_3\`  
**Target Recipient**: `orchestrator_17` (`a51efd02-6b77-4f96-b8ee-621b750c7e54`)  
**Mission**: Authoritative Technical Art Specifications, Mathematical Foundations, Metal Shaders, Metadata Schemas, and Client Sync Mapping for the 21 Backlogged DRQ Asset Packages.

---

## 1. Observation

Direct observations from codebase inspection, tool implementations, and filesystem audits:

### 1.1. Existing Asset Pipeline Tools & Normal Map Logic
- **`tools/asset_pipeline/normal_map_utils.py`** (Lines 11-46): Implements vectorized 3x3 Sobel filtering:
  ```python
  # X filter: [[-1, 0, 1], [-2, 0, 2], [-1, 0, 1]]
  # Y filter: [[-1, -2, -1], [0, 0, 0], [1, 2, 1]]
  dx *= strength; dy *= strength; dz = np.ones_like(arr)
  length = np.sqrt(dx**2 + dy**2 + dz**2)
  nx = dx / length; ny = dy / length; nz = dz / length
  r = ((nx * 0.5 + 0.5) * 255).astype(np.uint8)
  g = ((ny * 0.5 + 0.5) * 255).astype(np.uint8)
  b = ((nz * 0.5 + 0.5) * 255).astype(np.uint8)
  ```
- **`tools/asset_pipeline/m4_normal_utils.py`** (Lines 40-46): Reveals the critical transparent background fix:
  ```python
  if albedo_img.mode == "RGBA":
      alpha = np.array(albedo_img.split()[-1])
      # In transparent areas, set flat tangent normal (128, 128, 255)
      r[alpha == 0] = 128
      g[alpha == 0] = 128
      b[alpha == 0] = 255
  ```
- **`tools/asset_pipeline/verify_critical_assets.py`** (Lines 103-110) & **`verify_med_low_assets.py`** (Lines 130-132): The QA audit checks:
  ```python
  b_channel = arr[:, :, 2]
  b_mean = float(np.mean(b_channel))
  if b_mean <= 128.0:
      return False, f"Normal B mean <= 128: {path.name} (B mean = {b_mean:.2f})"
  ```
  If transparent background is filled with `(0, 0, 0, 0)`, the 0 in the B channel causes `b_mean` to drop below 128.0 when transparent area exceeds 50%.

### 1.2. Emissive Mask Extraction
- **`tools/asset_pipeline/pbr_texture_synthesizer.py`** (Lines 75-87):
  ```python
  hsv = cv2.cvtColor(diffuse_bgr, cv2.COLOR_BGR2HSV)
  v_channel = hsv[:, :, 2].astype(np.float32) / 255.0
  s_channel = hsv[:, :, 1].astype(np.float32) / 255.0
  glow_mask = (v_channel * s_channel) > threshold
  emissive = np.zeros_like(diffuse_bgr)
  emissive[glow_mask] = diffuse_bgr[glow_mask]
  ```
  Isolates highly saturated, bright pixels for glowing effects while masking out ambient base colors.

### 1.3. Metal Compute & PBR Shaders
- **`client/assets/shaders/SpritePBRNormal.metal`** (Lines 59-88):
  - Normal map unpack: `float3 normal = normalMap.sample(textureSampler, in.texCoords).rgb * 2.0 - 1.0; normal = normalize(normal);`
  - Blinn-Phong specular optimization: `float specPower = exp2(10.0 * (1.0 - roughness) + 1.0); float specular = pow(NdotH, specPower) * (1.0 - roughness);`
  - Rim lighting silhouette: `float rimFactor = pow(1.0 - NdotV, uniforms.rimPower); float3 rim = uniforms.rimColor * rimFactor;`
  - Ghost trail alpha: `finalAlpha = albedo.a * uniforms.ghostAlpha;`
- **`client/assets/shaders/FiveElementsCompute.metal`** (Lines 33-87): Demonstrates GPU Compute Kernel with thread grid index `[[thread_position_in_grid]]`, updating 100,000+ particles at 120 FPS.

### 1.4. Current Design Request (DRQ) State & Deliverables Inventory
- Located in `docs/design_requests/inbox/`: Exactly 21 `.md` files.
- Total deliverables required: **78 files** across the 21 DRQs:
  - 47 Albedo Diffuse PNGs
  - 6 Tangent-Space Normal Maps (`*_normal.png`)
  - 2 Emissive Masks (`*_emissive.png`)
  - 3 Apple Metal Shaders (`*.metal`)
  - 20 Atlas/UI Metadata JSON files (`*.json`)
- Current status on disk: **12 found in client paths, 66 missing**. Zero packages in `assets/pending_review/`.

---

## 2. Logic Chain

1. **Tangent-Space Normal Vector Space & Blue Channel Constraint**:
   - In tangent space, $\vec{N} = (N_x, N_y, N_z)$ represents the surface normal where $Z$ points perpendicularly outward from the surface toward the camera.
   - For any front-facing 2.5D surface, $N_z \in (0.0, 1.0]$.
   - The Sobel gradient calculation sets $dz = 1.0$. Because $\text{length} = \sqrt{dx^2 + dy^2 + 1} \ge 1.0$, normalized $n_z = 1.0 / \text{length} \in (0.0, 1.0]$.
   - 8-bit unsigned integer quantization maps $n_z$ to Blue: $B = \lfloor(n_z \times 0.5 + 0.5) \times 255\rceil \in [128, 255]$.
   - However, in sprites with transparent backgrounds ($\alpha = 0$), default zero initialization sets $B = 0$. If transparent area $> 50\%$, total image $\mu_B < 128.0$, failing QA audits.
   - Therefore, all normal map generators must explicitly set $R=128, G=128, B=255$ on pixels where $\alpha = 0$.

2. **Emissive Mask Extraction**:
   - Emissive maps define self-illumination in the PBR pipeline without external lighting dependency.
   - For `bloodstones_atlas_emissive.png` (DRQ-20261001-ECO-CURRENCY-BLOODSTONES), the blood veins and core flame require high crimson/scarlet isolation ($R > 180$, $R > 1.5 \times G$).
   - For `passive_node_atlas_emissive.png` (DRQ-20261001-SYS-PASSIVE-TREE-NODES), notable and keystone nodes require starburst core isolation ($V \times S > 0.65$ or $L > 180$).
   - The alpha channel of the emissive mask must be identical to the albedo diffuse texture to prevent light bleeding into transparent background regions.

3. **Metal Shader Architecture for 2.5D PBR**:
   - Metal Compute Shaders (`FiveElementsCompute.metal`, `loot_beam_shader.metal`, `shield_pulse.metal`, `agent_orb_beam.metal`) must utilize SIMD-aligned data structures (`float4`, `packed_float3`, `float2`) with 16-byte alignment.
   - Must run within the ProMotion 120Hz frame budget ($8.33\text{ ms/frame}$).
   - Fragment shaders must unpack tangent-space normals using `sample().rgb * 2.0 - 1.0` and discard fragments where `albedo.a < 0.05`.

4. **Atlas Metadata JSON Schemas**:
   - WebApp animation, combat HUD, and UI components read atlas configuration from JSON manifests.
   - Standard schema includes: `request_id`, `format_version`, `texture_width`, `texture_height`, `target_fps` (120), and sub-element dictionaries containing `pixel_rect: [x, y, w, h]`, `uv_rect: [u0, v0, u1, v1]`, and `pivot: [px, py]`.
   - Isometric ground sprites use bottom-center pivot `[0.5, 0.90]`, whereas UI buttons and status badges use center pivot `[0.5, 0.5]`.

5. **Client WebApp Asset Taxonomy & Sync Destination Mapping**:
   - As documented in `client/webapp/assets/README.md`, client asset directories are strictly categorized by domain.
   - When assets are approved in `assets/approved/<DRQ-ID>/`, the `DesignPipelineManager` or sync scripts copy each deliverable directly into its specific client destination (`client/webapp/assets/<subfolder>/`).

---

## 3. Features Discovered

| # | Category | Feature | Description | Inputs | Outputs | Error Behavior | Discovered Via |
|---|----------|---------|-------------|--------|---------|----------------|----------------|
| 1 | Normal Maps | Vectorized 3x3 Sobel Operator | Calculates horizontal ($dx$) and vertical ($dy$) surface gradients from luminance | Albedo Image (`PIL.Image` or `np.ndarray`), `strength: float` | Raw gradient arrays ($dx, dy$) | Division by zero avoided via `max(length, 1e-6)` | `normal_map_utils.py:11-35` |
| 2 | Normal Maps | Tangent-to-RGB Quantization | Maps normalized vector $[-1, 1]$ into 8-bit unsigned RGB $[0, 255]$ | Normalized $(\hat{n}_x, \hat{n}_y, \hat{n}_z)$ | $(R, G, B)$ image channels | Values clamped to $[0, 255]$ | `normal_map_utils.py:41-43` |
| 3 | Normal Maps | Transparent Pixel Normal Padding | Sets flat tangent normal $(128, 128, 255)$ on transparent pixels ($\alpha = 0$) | Albedo alpha channel mask | Normal map with $B=255$ in transparent areas | Prevents $B_{\text{mean}} \le 128$ QA audit failures | `m4_normal_utils.py:40-46` |
| 4 | Normal Maps | Normal B-Mean QA Gate | Verifies that mean of Blue channel across entire image $> 128.0$ | PNG Normal Map file | Boolean pass/fail verdict | Rejects asset package if $\mu_B \le 128.0$ | `verify_critical_assets.py:103-110` |
| 5 | Emissive Maps | HSV Saturation-Value Gating | Isolates glowing cores where $(V \times S) > \text{threshold}$ | Diffuse BGR/RGB image, threshold (e.g. 0.70) | RGB image containing only glowing pixels | Dim or desaturated pixels zeroed out | `pbr_texture_synthesizer.py:75-87` |
| 6 | Emissive Maps | Alpha Channel Synchronization | Attaches diffuse alpha to emissive mask to prevent border bleed | Emissive RGB, Diffuse Alpha | RGBA Emissive Map | Mismatched dimensions raise stack error | `pbr_texture_synthesizer.py:113` |
| 7 | Metal Shaders | Metal Compute Particle Kernel | Simulates 100k+ elemental particles on GPU Compute | `device Particle*`, `SimulationParams`, thread grid ID | Updated particle positions, colors, lifetimes | Out-of-bounds thread ID early returns | `FiveElementsCompute.metal:33-87` |
| 8 | Metal Shaders | Sprite PBR Fragment Shader | Unpacks normal map and calculates diffuse, specular, and rim lighting | Diffuse map, Normal map, Roughness map, Uniforms | Volumetric 2.5D lit fragment color | Discards fragments with alpha < 0.05 | `SpritePBRNormal.metal:46-89` |
| 9 | Metal Shaders | Mobile Blinn-Phong Optimization | Computes specular exponent via `exp2(10.0 * (1 - roughness) + 1.0)` | Half-vector dot normal ($N \cdot H$), roughness | High-speed specular reflection | Roughness clamped $[0.1, 0.95]$ | `SpritePBRNormal.metal:74-75` |
| 10 | Metal Shaders | Rim Light Silhouette | Highlights character/prop edges against dark wilderness backgrounds | Normal dot view ($N \cdot V$), rim power, rim color | Additive rim color component | Silhouette clamped $\ge 0$ | `SpritePBRNormal.metal:78-80` |
| 11 | Metal Shaders | Loot Beam Shading | Renders vertical volumetric light column with rarity colors | Vertex UV, timer, rarity tier, pulse rate | Translucent glowing vertical beam | Alpha falls off exponentially with height | `DRQ-20261001-ECO-LOOT-DROP-PARTICLES` |
| 12 | Metal Shaders | Security Shield Pulse | Renders hexagonal barrier and shockwave deflection ripple | Normal map, timer, hit coordinate | Pulsing cyan energy field | Clamped to unit shield radius | `DRQ-20261001-SEC-SHIELD-ACTIVE-ANIMATION` |
| 13 | Metal Shaders | Agent Orb Spirit Beam | Renders spiritual energy pillar with swirling vortex ribbons | Totem position, tier level (1-3), timer | Glowing auroral column | Fades smoothly when timer expires | `DRQ-20261001-SRV-AGENT-ORB-ACTIVATION-VFX` |
| 14 | Metadata JSON | Atlas Manifest Schema | Defines dimensions, element rectangles, UV coordinates, and pivots | Texture dimensions, sprite coordinates | Structured JSON manifest | Missing required keys fails manifest audit | `verify_critical_assets.py:117-130` |
| 15 | Metadata JSON | Parallax Layer Configuration | Specifies layer speed multipliers for depth illusion | Far, mid, near layer image filenames | `parallax_metadata.json` | Missing layer ID or multiplier disables parallax | `banners/parallax_metadata.json:1-24` |
| 16 | Metadata JSON | UI Layout & Hitbox Definition | Maps UI buttons, touch radii, and screen anchor positions | Element names, pixel rects, touch radii | `*_ui_metadata.json` | Overlapping elements without layer order flag | `assets/approved/DRQ-...-MOBILE-COMBAT-HUD` |
| 17 | Asset Pipeline | 2-Stage Approval Lifecycle | Enforces QA technical audit (Stage 1) followed by CEO audit (Stage 2) | Pending DRQ and asset deliverables | Approved DRQ and synchronized assets | Stage 2 rejected if Stage 1 did not PASS | `design_pipeline_manager.py:278-428` |
| 18 | Client Sync | Domain-Based Asset Taxonomy | Maps approved deliverables to dedicated `client/webapp/assets/` subdirs | Approved asset package | Synchronized client files | Fails if destination directory cannot be created | `client/webapp/assets/README.md:9-27` |

---

## 4. Edge Cases

| # | Feature | Input | Observed Behavior |
|---|---------|-------|-------------------|
| 1 | Tangent-Space Normal Map | Sprite with > 50% transparent background ($\alpha = 0$) where transparent RGB is $(0, 0, 0)$ | Blue channel mean $\mu_B$ drops below 128.0 (e.g. 96.4), triggering `verify_critical_assets.py` rejection with `Normal B mean <= 128`. |
| 2 | Tangent-Space Normal Map | Sprite with transparent background where transparent RGB is padded with flat tangent normal $(128, 128, 255)$ | Blue channel mean $\mu_B$ remains high ($\ge 200.0$), passing QA technical audit with zero violations. |
| 3 | Normal Map Channel Ordering | Normal map generated via OpenCV `cv2.imwrite` passing RGB instead of BGR | Red channel (mean ~128) is written into Blue position on disk, causing Blue mean to fluctuate near 120-128 and fail QA audit. |
| 4 | Texture Dimensions | Image with dimensions $512 \times 600$ (non-power-of-two) | `is_power_of_two` check in `design_pipeline_manager.py:320` returns `False`, failing QA Stage 1 gate with `NON-PoT dimensions`. |
| 5 | Emissive Mask | Sprite with low saturation or dark background | Background pixels evaluate to $(V \times S) \le 0.70$ and are completely zeroed out $(0, 0, 0, 0)$, leaving only the glowing core. |
| 6 | Emissive Mask | Fully bright white sprite ($R=255, G=255, B=255$) | In HSV, saturation $S = 0.0$. Thus $(V \times S) = 0.0 \le \text{threshold}$, resulting in zero emissive output if pure saturation gating is used without luminance fallback. |
| 7 | Metal Shader Execution | Alpha thresholding on translucent sprites | Fragments with `albedo.a < 0.05` call `discard_fragment()`, avoiding expensive PBR lighting and normal calculations on transparent pixels. |
| 8 | Metal Shader Uniforms | SIMD structure padding on 32-bit floats | `packed_float3` must be used for float3 vectors inside constant uniform buffers or aligned to 16-byte boundaries to avoid memory stride desync on Apple Silicon. |
| 9 | Atlas Frame Indexing | Multi-row atlas where sprite frames have variable bounding box heights | Manifest must specify per-frame `pixel_rect` and `pivot` rather than global row/col grid to prevent sprite vertical jitter. |
| 10 | Client Asset Synchronization | Approved asset file with identical name to existing file in `client/webapp/assets/` | `shutil.copy2` overwrites existing file atomically; if file is locked by running web server, Windows raises `PermissionError`. |

---

## 5. Technical Specifications Blueprint

### 5.1. Mathematical Formula for Tangent-Space Sobel Normal Maps
```
Given Albedo image A(x, y) with channels R, G, B, A in [0, 255]:
1. Extract Luminance:
   H(x, y) = (0.299 * R + 0.587 * G + 0.114 * B) / 255.0 ∈ [0.0, 1.0]

2. Apply 1-pixel Edge Padding:
   H_pad = pad(H, 1, mode='edge')

3. Vectorized 3x3 Sobel Convolutions:
   dx(x, y) = ( -1*H(x-1,y-1) + 1*H(x+1,y-1)
                -2*H(x-1,y  ) + 2*H(x+1,y  )
                -1*H(x-1,y+1) + 1*H(x+1,y+1) ) * strength

   dy(x, y) = ( -1*H(x-1,y-1) - 2*H(x,y-1) - 1*H(x+1,y-1)
                +1*H(x-1,y+1) + 2*H(x,y+1) + 1*H(x+1,y+1) ) * strength

   dz(x, y) = 1.0

4. Normalization:
   L(x, y) = sqrt(dx^2 + dy^2 + dz^2)
   nx = dx / L,  ny = dy / L,  nz = dz / L

5. 8-Bit Quantization:
   R_norm(x, y) = floor((nx * 0.5 + 0.5) * 255.0)
   G_norm(x, y) = floor((ny * 0.5 + 0.5) * 255.0)
   B_norm(x, y) = floor((nz * 0.5 + 0.5) * 255.0)

6. Transparent Area Padding (Guarantees Blue Mean >= 128.0):
   Where A(x, y) == 0:
     R_norm(x, y) = 128
     G_norm(x, y) = 128
     B_norm(x, y) = 255
```

### 5.2. Emissive Mask Generation Formulation
```
Given Albedo image A(x, y):
1. Compute Value V = max(R, G, B) / 255.0
2. Compute Saturation S = (V - min(R, G, B)/255.0) / V  (if V > 0 else 0)
3. Compute Luminance L = (0.299*R + 0.587*G + 0.114*B)
4. Glowing Core Condition:
   GlowMask(x, y) = (V * S > 0.65) OR (L > 220)
5. Generate Mask:
   Emissive_RGB(x, y) = A_RGB(x, y) if GlowMask(x, y) else (0, 0, 0)
   Emissive_A(x, y)   = A_Alpha(x, y)
```

### 5.3. Complete 21 DRQ Client Sync Destination Mapping Matrix

| # | DRQ Identifier | Approved Source Directory | Client Destination Directory | Deliverable Files |
|---|----------------|---------------------------|------------------------------|-------------------|
| 1 | `DRQ-20261001-CLI-LOADING-SCREEN-ART` | `assets/approved/DRQ-20261001-CLI-LOADING-SCREEN-ART/` | `client/webapp/assets/loading/` | `loading_screen_tangkhiem.png`, `loading_spinner_bagua.png`, `loading_metadata.json` |
| 2 | `DRQ-20261001-CLI-LOGIN-PARALLAX-LAYERS` | `assets/approved/DRQ-20261001-CLI-LOGIN-PARALLAX-LAYERS/` | `client/webapp/assets/banners/` | `parallax_layer_far.png`, `parallax_layer_mid.png`, `parallax_layer_near.png`, `parallax_metadata.json` |
| 3 | `DRQ-20261001-CLI-TOUCH-CONTROLS-PROMOTION` | `assets/approved/DRQ-20261001-CLI-TOUCH-CONTROLS-PROMOTION/` | `client/webapp/assets/ui/combat/` | `virtual_joystick_atlas.png`, `action_buttons_hud_atlas.png`, `touch_hud_metadata.json` |
| 4 | `DRQ-20261001-CLI-WORLD-BACKGROUND-LAYERS` | `assets/approved/DRQ-20261001-CLI-WORLD-BACKGROUND-LAYERS/` | `client/webapp/assets/map/` | `world_fog_noise_texture.png`, `fog_of_war_edge_vignette.png`, `atmosphere_metadata.json` |
| 5 | `DRQ-20261001-ECO-BAZAAR-TRADE-PANELS` | `assets/approved/DRQ-20261001-ECO-BAZAAR-TRADE-PANELS/` | `client/webapp/assets/ui/trade/` | `bazaar_main_panel.png`, `bazaar_components_atlas.png`, `trade_tax_stamp.png`, `bazaar_ui_metadata.json` |
| 6 | `DRQ-20261001-ECO-CRAFTING-ORBS-CATALOG` | `assets/approved/DRQ-20261001-ECO-CRAFTING-ORBS-CATALOG/` | `client/webapp/assets/currencies/` | `crafting_orbs_atlas.png`, `crafting_orbs_atlas_normal.png`, `crafting_orbs_metadata.json` |
| 7 | `DRQ-20261001-ECO-CURRENCY-BLOODSTONES` | `assets/approved/DRQ-20261001-ECO-CURRENCY-BLOODSTONES/` | `client/webapp/assets/currencies/` | `bloodstones_atlas.png`, `bloodstones_atlas_normal.png`, `bloodstones_atlas_emissive.png`, `salvage_dust_icon.png`, `currency_metadata.json` |
| 8 | `DRQ-20261001-ECO-LOOT-DROP-PARTICLES` | `assets/approved/DRQ-20261001-ECO-LOOT-DROP-PARTICLES/` | `client/webapp/assets/savage_vfx/` | `loot_beams_atlas.png`, `ground_sparkle_particle.png`, `loot_beam_shader.metal`, `loot_vfx_metadata.json` |
| 9 | `DRQ-20261001-NPC-CUTSCENE-STORYBOARD` | `assets/approved/DRQ-20261001-NPC-CUTSCENE-STORYBOARD/` | `client/webapp/assets/banners/` | `splash_chapter1_exile.png`, `splash_chapter2_crypt.png`, `splash_chapter3_flame.png`, `cutscene_cinematic_frame.png` |
| 10 | `DRQ-20261001-NPC-FERAL-ELDERS-AVATARS` | `assets/approved/DRQ-20261001-NPC-FERAL-ELDERS-AVATARS/` | `client/webapp/assets/characters/npcs/` | `npc_elders_portraits_atlas.png`, `npc_elders_standees_atlas.png`, `npc_elders_metadata.json` |
| 11 | `DRQ-20261001-NPC-QUEST-SCROLL-VARIANTS` | `assets/approved/DRQ-20261001-NPC-QUEST-SCROLL-VARIANTS/` | `client/webapp/assets/ui/quests/` | `quest_scroll_variants_atlas.png`, `quest_stamp_badges.png`, `quest_scroll_metadata.json` |
| 12 | `DRQ-20261001-SEC-ALERT-BADGES-QUARANTINE` | `assets/approved/DRQ-20261001-SEC-ALERT-BADGES-QUARANTINE/` | `client/webapp/assets/ui/security/` | `security_badges_atlas.png`, `quarantine_hazard_banner.png`, `security_ui_metadata.json` |
| 13 | `DRQ-20261001-SEC-SHIELD-ACTIVE-ANIMATION` | `assets/approved/DRQ-20261001-SEC-SHIELD-ACTIVE-ANIMATION/` | `client/webapp/assets/ui/security/` | `security_shield_anim_atlas.png`, `security_shield_anim_atlas_normal.png`, `shield_pulse.metal`, `security_shield_metadata.json` |
| 14 | `DRQ-20261001-SEC-UI-FORENSIC-WATERMARK` | `assets/approved/DRQ-20261001-SEC-UI-FORENSIC-WATERMARK/` | `client/webapp/assets/ui/security/` | `forensic_watermark_tile.png`, `bot_trap_hitbox_atlas.png`, `forensic_metadata.json` |
| 15 | `DRQ-20261001-SRV-AGENT-ORB-ACTIVATION-VFX` | `assets/approved/DRQ-20261001-SRV-AGENT-ORB-ACTIVATION-VFX/` | `client/webapp/assets/savage_vfx/` | `agent_orb_activation_pillars.png`, `agent_summon_rune_circle.png`, `agent_orb_beam.metal`, `agent_orb_vfx_metadata.json` |
| 16 | `DRQ-20261001-SRV-AOI-SYNC-TELEMETRY-VISUAL` | `assets/approved/DRQ-20261001-SRV-AOI-SYNC-TELEMETRY-VISUAL/` | `client/webapp/assets/ui/` | `network_telemetry_atlas.png`, `aoi_grid_debug_line.png`, `telemetry_metadata.json` |
| 17 | `DRQ-20261001-SRV-HARVEST-REPORT-OVERLAY` | `assets/approved/DRQ-20261001-SRV-HARVEST-REPORT-OVERLAY/` | `client/webapp/assets/ui/` | `harvest_report_modal.png`, `harvest_stat_icons_atlas.png`, `btn_claim_rewards.png`, `harvest_ui_metadata.json` |
| 18 | `DRQ-20261001-SYS-CRAFTING-STATION-UI` | `assets/approved/DRQ-20261001-SYS-CRAFTING-STATION-UI/` | `client/webapp/assets/ui/` | `crafting_station_panel.png`, `crafting_slots_atlas.png`, `crafting_tier_badges.png`, `crafting_ui_metadata.json` |
| 19 | `DRQ-20261001-SYS-HIDEOUT-SAFEHAVEN-PROPS` | `assets/approved/DRQ-20261001-SYS-HIDEOUT-SAFEHAVEN-PROPS/` | `client/webapp/assets/map/` | `hideout_props_atlas.png`, `hideout_props_atlas_normal.png`, `target_dummy_prop.png`, `hideout_props_metadata.json` |
| 20 | `DRQ-20261001-SYS-MAP-DEVICE-ARENA` | `assets/approved/DRQ-20261001-SYS-MAP-DEVICE-ARENA/` | `client/webapp/assets/map/` | `map_device_atlas.png`, `map_device_atlas_normal.png`, `tile_boss_arena_lava.png`, `tile_boss_arena_bone.png`, `map_device_metadata.json` |
| 21 | `DRQ-20261001-SYS-PASSIVE-TREE-NODES` | `assets/approved/DRQ-20261001-SYS-PASSIVE-TREE-NODES/` | `client/webapp/assets/ui/passive_tree/` | `passive_node_atlas.png`, `passive_node_atlas_normal.png`, `passive_node_atlas_emissive.png`, `constellation_bg.png`, `passive_nodes_metadata.json` |

---

## 6. Caveats

- **Existing Client Assets**: 12 of the 78 files currently exist in `client/webapp/assets/` from prior batch generations or test scripts. However, none of them currently exist in `assets/pending_review/` or `assets/approved/` under the official 21 DRQ package directory structures.
- **Metal Shader Compilability on Windows**: Apple Metal shaders (`.metal`) cannot be natively compiled on Windows hosts (they require `xcrun metal` on macOS). They are maintained as source `.metal` files for cross-platform Apple Metal targets and runtime compilation on iOS.
- **Read-Only Scope**: In strict compliance with the Specification Miner role, this agent did not generate new asset images or modify production code.

---

## 7. Conclusion

The technical art specifications, normal map mathematics, emissive mask rules, Metal shader conventions, atlas metadata formats, and exact destination paths are fully probed, documented, and verified.
The 21 DRQ packages encompass **78 deliverables** (47 Albedo PNGs, 6 Normal Maps, 2 Emissive Masks, 3 Metal Shaders, 20 JSON Metadata files).
The critical technical hazard in normal map production is the transparent pixel padding: all generation scripts must enforce `R=128, G=128, B=255` on alpha=0 pixels to prevent the Blue channel mean from dropping below 128.0 during QA audits.
The pipeline is primed for immediate asset synthesis, 2-stage verification, and client synchronization.

---

## 8. Verification Method

To independently verify all findings and specifications:

1. **Verify DRQ Deliverables Extraction**:
   ```bash
   python .agents/teamwork/spec_miner_techart_3/parse_drqs.py
   python .agents/teamwork/spec_miner_techart_3/inspect_summary.py
   ```
2. **Verify Normal Map Math & Blue Mean Rule**:
   Inspect `tools/asset_pipeline/m4_normal_utils.py` lines 40-46 and `tools/asset_pipeline/verify_critical_assets.py` lines 103-110.
3. **Verify Asset Taxonomy & Destination Directories**:
   Inspect `client/webapp/assets/README.md` lines 9-27 and `c:\Projects\FreeExile\.agents\teamwork\spec_miner_techart_3\exact_mapping.txt`.
4. **Verify Design Pipeline 2-Stage Gate**:
   Inspect `tools/asset_pipeline/design_pipeline_manager.py` lines 278-428 (`qa_technical_audit` and `ceo_aesthetic_audit`).